Subnet Calculator
Calculate IPv4 networks, host ranges, and subnet masks.
Look up OSI layers, VLAN ranges, common MTUs, and port ranges.
Your result will appear here.
Enter your input, then run the tool.Select Run tool to use network reference.
Use the labeled units and valid search network reference. The Example button supplies a reproducible starting input.
Calculate IPv4 networks, host ranges, and subnet masks.
Query public PTR records for an IPv4 address.
Check IPv6 address syntax, including compressed notation.